That silver piece you see in the lower grill is one of the horn solenoids:
I find that most people driving on the highway can't hear the X3s regular horn while driving 65mph, listening to music, and talking on their cell phone. This horn combination seems to get their attention

Quote:

Originally Posted by -jay-

how do you take off the wheel well lining? is it easy?

You can get access to that area by remove a set of screws with an 8mm socket or nut driver. Remove the screws on the passenger side marked # 2 here:

Then remove screws marked #1-3 on the wheel-well liner which will allow you to pull the wheel well liner (#4) back so you can access the rear of the bumper.

You should be able to get the screws out, push the bumper back in place and re-install the screws in under 10 minutes.